Question

My webpage animates scrolling when users click on links to the same page. I want to cancel this animation as soon as the user tries to scroll (otherwise the user and the browser are fighting for control) – no matter whether with the mouse wheel, the keyboard or the scrollbar (or any other way – are there other ways of scrolling?). I managed to cancel the animation after the mouse wheel or keyboard are used, how do I get this working with the scrollbar?

Here is how my code looks for the keyboard:

$(document.documentElement).keydown( function (event) {
    if(event.keyCode == 38 || 40) stopScroll();
});

function stopScroll() {
    $("html, body").stop(true, false);
}

I also tried a more elegant way of doing this by using scroll(), the problem is that scroll() catches everything including the animated and automated scrolling. I could not think of any way to let it catch all scrolling except the animated scrolling.

Answer 1

you need animation marker, something like this

$("html, body").stop(true, false).prop('animatedMark',0.0).animate({scrollTop : top, animatedMark: '+=1.0'})

Here is the code, the code was mix of GWT and javascript so moved it to js, not fully tested, please try it

var lastAnimatedMark=0.0;
function scrollToThis(top){
    // Select/ stop any previous animation / reset the mark to 0 
    // and finally animate the scroll and the mark
    $("html, body").stop(true, false).prop('animatedMark',0.0).
    animate({scrollTop : top, animatedMark: '+=1.0'}
    ,10000,function(){
        //We finished , nothing just clear the data         
        lastAnimatedMark=0.0;
        $("html, body").prop('animatedMark',0.0);
    });
}
//Gets the animatedMark value
function animatedMark() {
    var x=$("html, body").prop('animatedMark');
    if (x==undefined){
        $("html, body").prop('animatedMark', 0.0);
    }
    x=$("html, body").prop('animatedMark');
    return x;
};

//Kills the animation
function stopBodyAnimation() {
    lastAnimatedMark=0;
    $("html, body").stop(true, false);
}
//This should be hooked to window scroll event 
function scrolled(){
    //get current mark
    var currentAnimatedMark=animatedMark();         
    //mark must be more than zero (jQuery animation is on) & but 
    //because last=current , this is user interaction.
    if (currentAnimatedMark>0 && (lastAnimatedMark==currentAnimatedMark)) {
        //During Animation but the marks are the same ! 
        stopBodyAnimation();
        return;
    }

    lastAnimatedMark=currentAnimatedMark;    
}

Here is the blog about it

http://alaamurad.com/blog/#!canceling-jquery-animation-after-user-interaction

Enjoy!